modules/rtp_rtcp/source/rtp_payload_registry_unittest.cc - src/webrtc - Git at Google

 /*
  *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */

 #include <memory>

 #include "webrtc/common_types.h"
 #include "webrtc/modules/rtp_rtcp/include/rtp_header_parser.h"
 #include "webrtc/modules/rtp_rtcp/include/rtp_payload_registry.h"
 #include "webrtc/modules/rtp_rtcp/source/byte_io.h"
 #include "webrtc/modules/rtp_rtcp/source/rtp_utility.h"
 #include "webrtc/test/gmock.h"
 #include "webrtc/test/gtest.h"

 namespace webrtc {

 using ::testing::Eq;
 using ::testing::Return;
 using ::testing::StrEq;
 using ::testing::_;

 static const char* kTypicalPayloadName = "name";
 static const size_t kTypicalChannels = 1;
 static const uint32_t kTypicalFrequency = 44000;
 static const CodecInst kTypicalAudioCodec = {-1 /* pltype */, "name",
                                              kTypicalFrequency, 0 /* pacsize */,
                                              kTypicalChannels};

 TEST(RtpPayloadRegistryTest,
      RegistersAndRemembersVideoPayloadsUntilDeregistered) {
   RTPPayloadRegistry rtp_payload_registry;
   const uint8_t payload_type = 97;
   VideoCodec video_codec;
   video_codec.codecType = kVideoCodecVP8;
   strncpy(video_codec.plName, "VP8", RTP_PAYLOAD_NAME_SIZE);
   video_codec.plType = payload_type;

   EXPECT_EQ(0, rtp_payload_registry.RegisterReceivePayload(video_codec));

   const RtpUtility::Payload* retrieved_payload =
       rtp_payload_registry.PayloadTypeToPayload(payload_type);
   EXPECT_TRUE(retrieved_payload);

   // We should get back the corresponding payload that we registered.
   EXPECT_STREQ("VP8", retrieved_payload->name);
   EXPECT_FALSE(retrieved_payload->audio);
   EXPECT_EQ(kRtpVideoVp8, retrieved_payload->typeSpecific.Video.videoCodecType);

   // Now forget about it and verify it's gone.
   EXPECT_EQ(0, rtp_payload_registry.DeRegisterReceivePayload(payload_type));
   EXPECT_FALSE(rtp_payload_registry.PayloadTypeToPayload(payload_type));
 }

 TEST(RtpPayloadRegistryTest,
      RegistersAndRemembersAudioPayloadsUntilDeregistered) {
   RTPPayloadRegistry rtp_payload_registry;
   uint8_t payload_type = 97;
   bool new_payload_created = false;
   CodecInst audio_codec = kTypicalAudioCodec;
   audio_codec.pltype = payload_type;
   EXPECT_EQ(0, rtp_payload_registry.RegisterReceivePayload(
                    audio_codec, &new_payload_created));

   EXPECT_TRUE(new_payload_created) << "A new payload WAS created.";

   const RtpUtility::Payload* retrieved_payload =
       rtp_payload_registry.PayloadTypeToPayload(payload_type);
   EXPECT_TRUE(retrieved_payload);

   // We should get back the corresponding payload that we registered.
   EXPECT_STREQ(kTypicalPayloadName, retrieved_payload->name);
   EXPECT_TRUE(retrieved_payload->audio);
   EXPECT_EQ(kTypicalFrequency, retrieved_payload->typeSpecific.Audio.frequency);
   EXPECT_EQ(kTypicalChannels, retrieved_payload->typeSpecific.Audio.channels);

   // Now forget about it and verify it's gone.
   EXPECT_EQ(0, rtp_payload_registry.DeRegisterReceivePayload(payload_type));
   EXPECT_FALSE(rtp_payload_registry.PayloadTypeToPayload(payload_type));
 }

 TEST(RtpPayloadRegistryTest, AudioRedWorkProperly) {
   const uint8_t kRedPayloadType = 127;
   const int kRedSampleRate = 8000;
   const size_t kRedChannels = 1;

   RTPPayloadRegistry rtp_payload_registry;

   bool new_payload_created = false;
   CodecInst red_audio_codec;
   strncpy(red_audio_codec.plname, "red", RTP_PAYLOAD_NAME_SIZE);
   red_audio_codec.pltype = kRedPayloadType;
   red_audio_codec.plfreq = kRedSampleRate;
   red_audio_codec.channels = kRedChannels;
   EXPECT_EQ(0, rtp_payload_registry.RegisterReceivePayload(
                    red_audio_codec, &new_payload_created));
   EXPECT_TRUE(new_payload_created);

   EXPECT_EQ(kRedPayloadType, rtp_payload_registry.red_payload_type());

   const RtpUtility::Payload* retrieved_payload =
       rtp_payload_registry.PayloadTypeToPayload(kRedPayloadType);
   EXPECT_TRUE(retrieved_payload);
   EXPECT_TRUE(retrieved_payload->audio);
   EXPECT_STRCASEEQ("red", retrieved_payload->name);

   // Sample rate is correctly registered.
   EXPECT_EQ(kRedSampleRate,
             rtp_payload_registry.GetPayloadTypeFrequency(kRedPayloadType));
 }

 TEST(RtpPayloadRegistryTest,
      DoesNotAcceptSamePayloadTypeTwiceExceptIfPayloadIsCompatible) {
   uint8_t payload_type = 97;
   RTPPayloadRegistry rtp_payload_registry;

   bool ignored = false;
   CodecInst audio_codec = kTypicalAudioCodec;
   audio_codec.pltype = payload_type;
   EXPECT_EQ(0,
             rtp_payload_registry.RegisterReceivePayload(audio_codec, &ignored));

   CodecInst audio_codec_2 = kTypicalAudioCodec;
   audio_codec_2.pltype = payload_type;
   // Make |audio_codec_2| incompatible with |audio_codec| by changing
   // the frequency.
   audio_codec_2.plfreq = kTypicalFrequency + 1;
   EXPECT_EQ(
       -1, rtp_payload_registry.RegisterReceivePayload(audio_codec_2, &ignored))
       << "Adding incompatible codec with same payload type = bad.";

   // Change payload type.
   audio_codec_2.pltype = payload_type - 1;
   EXPECT_EQ(
       0, rtp_payload_registry.RegisterReceivePayload(audio_codec_2, &ignored))
       << "With a different payload type is fine though.";

   // Ensure both payloads are preserved.
   const RtpUtility::Payload* retrieved_payload =
       rtp_payload_registry.PayloadTypeToPayload(payload_type);
   EXPECT_TRUE(retrieved_payload);
   EXPECT_STREQ(kTypicalPayloadName, retrieved_payload->name);
   EXPECT_TRUE(retrieved_payload->audio);
   EXPECT_EQ(kTypicalFrequency, retrieved_payload->typeSpecific.Audio.frequency);
   EXPECT_EQ(kTypicalChannels, retrieved_payload->typeSpecific.Audio.channels);

   retrieved_payload =
       rtp_payload_registry.PayloadTypeToPayload(payload_type - 1);
   EXPECT_TRUE(retrieved_payload);
   EXPECT_STREQ(kTypicalPayloadName, retrieved_payload->name);
   EXPECT_TRUE(retrieved_payload->audio);
   EXPECT_EQ(kTypicalFrequency + 1,
             retrieved_payload->typeSpecific.Audio.frequency);
   EXPECT_EQ(kTypicalChannels, retrieved_payload->typeSpecific.Audio.channels);

   // Ok, update the rate for one of the codecs. If either the incoming rate or
   // the stored rate is zero it's not really an error to register the same
   // codec twice, and in that case roughly the following happens.
   EXPECT_EQ(0,
             rtp_payload_registry.RegisterReceivePayload(audio_codec, &ignored));
 }

 TEST(RtpPayloadRegistryTest,
      RemovesCompatibleCodecsOnRegistryIfCodecsMustBeUnique) {
   uint8_t payload_type = 97;
   RTPPayloadRegistry rtp_payload_registry;

   bool ignored = false;
   CodecInst audio_codec = kTypicalAudioCodec;
   audio_codec.pltype = payload_type;
   EXPECT_EQ(0,
             rtp_payload_registry.RegisterReceivePayload(audio_codec, &ignored));
   CodecInst audio_codec_2 = kTypicalAudioCodec;
   audio_codec_2.pltype = payload_type - 1;
   EXPECT_EQ(
       0, rtp_payload_registry.RegisterReceivePayload(audio_codec_2, &ignored));

   EXPECT_FALSE(rtp_payload_registry.PayloadTypeToPayload(payload_type))
       << "The first payload should be "
          "deregistered because the only thing that differs is payload type.";
   EXPECT_TRUE(rtp_payload_registry.PayloadTypeToPayload(payload_type - 1))
       << "The second payload should still be registered though.";

   // Now ensure non-compatible codecs aren't removed. Make |audio_codec_3|
   // incompatible by changing the frequency.
   CodecInst audio_codec_3 = kTypicalAudioCodec;
   audio_codec_3.pltype = payload_type + 1;
   audio_codec_3.plfreq = kTypicalFrequency + 1;
   EXPECT_EQ(
       0, rtp_payload_registry.RegisterReceivePayload(audio_codec_3, &ignored));

   EXPECT_TRUE(rtp_payload_registry.PayloadTypeToPayload(payload_type - 1))
       << "Not compatible; both payloads should be kept.";
   EXPECT_TRUE(rtp_payload_registry.PayloadTypeToPayload(payload_type + 1))
       << "Not compatible; both payloads should be kept.";
 }

 TEST(RtpPayloadRegistryTest,
      LastReceivedCodecTypesAreResetWhenRegisteringNewPayloadTypes) {
   RTPPayloadRegistry rtp_payload_registry;
   rtp_payload_registry.set_last_received_payload_type(17);
   EXPECT_EQ(17, rtp_payload_registry.last_received_payload_type());

   bool media_type_unchanged = rtp_payload_registry.ReportMediaPayloadType(18);
   EXPECT_FALSE(media_type_unchanged);
   media_type_unchanged = rtp_payload_registry.ReportMediaPayloadType(18);
   EXPECT_TRUE(media_type_unchanged);

   bool ignored;
   CodecInst audio_codec = kTypicalAudioCodec;
   audio_codec.pltype = 34;
   EXPECT_EQ(0,
             rtp_payload_registry.RegisterReceivePayload(audio_codec, &ignored));

   EXPECT_EQ(-1, rtp_payload_registry.last_received_payload_type());
   media_type_unchanged = rtp_payload_registry.ReportMediaPayloadType(18);
   EXPECT_FALSE(media_type_unchanged);
 }

 class ParameterizedRtpPayloadRegistryTest
     : public ::testing::TestWithParam<int> {};

 TEST_P(ParameterizedRtpPayloadRegistryTest,
        FailsToRegisterKnownPayloadsWeAreNotInterestedIn) {
   RTPPayloadRegistry rtp_payload_registry;

   bool ignored;
   CodecInst audio_codec;
   strncpy(audio_codec.plname, "whatever", RTP_PAYLOAD_NAME_SIZE);
   audio_codec.pltype = GetParam();
   audio_codec.plfreq = 1900;
   audio_codec.channels = 1;
   EXPECT_EQ(-1,
             rtp_payload_registry.RegisterReceivePayload(audio_codec, &ignored));
 }

 INSTANTIATE_TEST_CASE_P(TestKnownBadPayloadTypes,
                         ParameterizedRtpPayloadRegistryTest,
                         testing::Values(64, 72, 73, 74, 75, 76, 77, 78, 79));

 class RtpPayloadRegistryGenericTest : public ::testing::TestWithParam<int> {};

 TEST_P(RtpPayloadRegistryGenericTest, RegisterGenericReceivePayloadType) {
   RTPPayloadRegistry rtp_payload_registry;

   bool ignored;
   CodecInst audio_codec;
   // Dummy values, except for payload_type.
   strncpy(audio_codec.plname, "generic-codec", RTP_PAYLOAD_NAME_SIZE);
   audio_codec.pltype = GetParam();
   audio_codec.plfreq = 1900;
   audio_codec.channels = 1;
   EXPECT_EQ(0,
             rtp_payload_registry.RegisterReceivePayload(audio_codec, &ignored));
 }

 // Generates an RTX packet for the given length and original sequence number.
 // The RTX sequence number and ssrc will use the default value of 9999. The
 // caller takes ownership of the returned buffer.
 const uint8_t* GenerateRtxPacket(size_t header_length,
                                  size_t payload_length,
                                  uint16_t original_sequence_number) {
   uint8_t* packet =
       new uint8_t[kRtxHeaderSize + header_length + payload_length]();
   // Write the RTP version to the first byte, so the resulting header can be
   // parsed.
   static const int kRtpExpectedVersion = 2;
   packet[0] = static_cast<uint8_t>(kRtpExpectedVersion << 6);
   // Write a junk sequence number. It should be thrown away when the packet is
   // restored.
   ByteWriter<uint16_t>::WriteBigEndian(packet + 2, 9999);
   // Write a junk ssrc. It should also be thrown away when the packet is
   // restored.
   ByteWriter<uint32_t>::WriteBigEndian(packet + 8, 9999);

   // Now write the RTX header. It occurs at the start of the payload block, and
   // contains just the sequence number.
   ByteWriter<uint16_t>::WriteBigEndian(packet + header_length,
                                        original_sequence_number);
   return packet;
 }

 void TestRtxPacket(RTPPayloadRegistry* rtp_payload_registry,
                    int rtx_payload_type,
                    int expected_payload_type,
                    bool should_succeed) {
   size_t header_length = 100;
   size_t payload_length = 200;
   size_t original_length = header_length + payload_length + kRtxHeaderSize;

   RTPHeader header;
   header.ssrc = 1000;
   header.sequenceNumber = 100;
   header.payloadType = rtx_payload_type;
   header.headerLength = header_length;

   uint16_t original_sequence_number = 1234;
   uint32_t original_ssrc = 500;

   std::unique_ptr<const uint8_t[]> packet(GenerateRtxPacket(
       header_length, payload_length, original_sequence_number));
   std::unique_ptr<uint8_t[]> restored_packet(
       new uint8_t[header_length + payload_length]);
   size_t length = original_length;
   bool success = rtp_payload_registry->RestoreOriginalPacket(
       restored_packet.get(), packet.get(), &length, original_ssrc, header);
   EXPECT_EQ(should_succeed, success)
       << "Test success should match should_succeed.";
   if (!success) {
     return;
   }

   EXPECT_EQ(original_length - kRtxHeaderSize, length)
       << "The restored packet should be exactly kRtxHeaderSize smaller.";

   std::unique_ptr<RtpHeaderParser> header_parser(RtpHeaderParser::Create());
   RTPHeader restored_header;
   ASSERT_TRUE(
       header_parser->Parse(restored_packet.get(), length, &restored_header));
   EXPECT_EQ(original_sequence_number, restored_header.sequenceNumber)
       << "The restored packet should have the original sequence number "
       << "in the correct location in the RTP header.";
   EXPECT_EQ(expected_payload_type, restored_header.payloadType)
       << "The restored packet should have the correct payload type.";
   EXPECT_EQ(original_ssrc, restored_header.ssrc)
       << "The restored packet should have the correct ssrc.";
 }

 TEST(RtpPayloadRegistryTest, MultipleRtxPayloadTypes) {
   RTPPayloadRegistry rtp_payload_registry;
   // Set the incoming payload type to 90.
   RTPHeader header;
   header.payloadType = 90;
   header.ssrc = 1;
   rtp_payload_registry.SetIncomingPayloadType(header);
   rtp_payload_registry.SetRtxSsrc(100);
   // Map two RTX payload types.
   rtp_payload_registry.SetRtxPayloadType(105, 95);
   rtp_payload_registry.SetRtxPayloadType(106, 96);

   TestRtxPacket(&rtp_payload_registry, 105, 95, true);
   TestRtxPacket(&rtp_payload_registry, 106, 96, true);
 }

 TEST(RtpPayloadRegistryTest, InvalidRtxConfiguration) {
   RTPPayloadRegistry rtp_payload_registry;
   rtp_payload_registry.SetRtxSsrc(100);
   // Fails because no mappings exist and the incoming payload type isn't known.
   TestRtxPacket(&rtp_payload_registry, 105, 0, false);
   // Succeeds when the mapping is used, but fails for the implicit fallback.
   rtp_payload_registry.SetRtxPayloadType(105, 95);
   TestRtxPacket(&rtp_payload_registry, 105, 95, true);
   TestRtxPacket(&rtp_payload_registry, 106, 0, false);
 }

 INSTANTIATE_TEST_CASE_P(TestDynamicRange,
                         RtpPayloadRegistryGenericTest,
                         testing::Range(96, 127 + 1));

 }  // namespace webrtc
	/*
	* Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
	*
	* Use of this source code is governed by a BSD-style license
	* that can be found in the LICENSE file in the root of the source
	* tree. An additional intellectual property rights grant can be found
	* in the file PATENTS. All contributing project authors may
	* be found in the AUTHORS file in the root of the source tree.
	*/

	#include <memory>

	#include "webrtc/common_types.h"
	#include "webrtc/modules/rtp_rtcp/include/rtp_header_parser.h"
	#include "webrtc/modules/rtp_rtcp/include/rtp_payload_registry.h"
	#include "webrtc/modules/rtp_rtcp/source/byte_io.h"
	#include "webrtc/modules/rtp_rtcp/source/rtp_utility.h"
	#include "webrtc/test/gmock.h"
	#include "webrtc/test/gtest.h"

	namespace webrtc {

	using ::testing::Eq;
	using ::testing::Return;
	using ::testing::StrEq;
	using ::testing::_;

	static const char* kTypicalPayloadName = "name";
	static const size_t kTypicalChannels = 1;
	static const uint32_t kTypicalFrequency = 44000;
	static const CodecInst kTypicalAudioCodec = {-1 /* pltype */, "name",
	kTypicalFrequency, 0 /* pacsize */,
	kTypicalChannels};

	TEST(RtpPayloadRegistryTest,
	RegistersAndRemembersVideoPayloadsUntilDeregistered) {
	RTPPayloadRegistry rtp_payload_registry;
	const uint8_t payload_type = 97;
	VideoCodec video_codec;
	video_codec.codecType = kVideoCodecVP8;
	strncpy(video_codec.plName, "VP8", RTP_PAYLOAD_NAME_SIZE);
	video_codec.plType = payload_type;

	EXPECT_EQ(0, rtp_payload_registry.RegisterReceivePayload(video_codec));

	const RtpUtility::Payload* retrieved_payload =
	rtp_payload_registry.PayloadTypeToPayload(payload_type);
	EXPECT_TRUE(retrieved_payload);

	// We should get back the corresponding payload that we registered.
	EXPECT_STREQ("VP8", retrieved_payload->name);
	EXPECT_FALSE(retrieved_payload->audio);
	EXPECT_EQ(kRtpVideoVp8, retrieved_payload->typeSpecific.Video.videoCodecType);

	// Now forget about it and verify it's gone.
	EXPECT_EQ(0, rtp_payload_registry.DeRegisterReceivePayload(payload_type));
	EXPECT_FALSE(rtp_payload_registry.PayloadTypeToPayload(payload_type));
	}

	TEST(RtpPayloadRegistryTest,
	RegistersAndRemembersAudioPayloadsUntilDeregistered) {
	RTPPayloadRegistry rtp_payload_registry;
	uint8_t payload_type = 97;
	bool new_payload_created = false;
	CodecInst audio_codec = kTypicalAudioCodec;
	audio_codec.pltype = payload_type;
	EXPECT_EQ(0, rtp_payload_registry.RegisterReceivePayload(
	audio_codec, &new_payload_created));

	EXPECT_TRUE(new_payload_created) << "A new payload WAS created.";

	const RtpUtility::Payload* retrieved_payload =
	rtp_payload_registry.PayloadTypeToPayload(payload_type);
	EXPECT_TRUE(retrieved_payload);

	// We should get back the corresponding payload that we registered.
	EXPECT_STREQ(kTypicalPayloadName, retrieved_payload->name);
	EXPECT_TRUE(retrieved_payload->audio);
	EXPECT_EQ(kTypicalFrequency, retrieved_payload->typeSpecific.Audio.frequency);
	EXPECT_EQ(kTypicalChannels, retrieved_payload->typeSpecific.Audio.channels);

	// Now forget about it and verify it's gone.
	EXPECT_EQ(0, rtp_payload_registry.DeRegisterReceivePayload(payload_type));
	EXPECT_FALSE(rtp_payload_registry.PayloadTypeToPayload(payload_type));
	}

	TEST(RtpPayloadRegistryTest, AudioRedWorkProperly) {
	const uint8_t kRedPayloadType = 127;
	const int kRedSampleRate = 8000;
	const size_t kRedChannels = 1;

	RTPPayloadRegistry rtp_payload_registry;

	bool new_payload_created = false;
	CodecInst red_audio_codec;
	strncpy(red_audio_codec.plname, "red", RTP_PAYLOAD_NAME_SIZE);
	red_audio_codec.pltype = kRedPayloadType;
	red_audio_codec.plfreq = kRedSampleRate;
	red_audio_codec.channels = kRedChannels;
	EXPECT_EQ(0, rtp_payload_registry.RegisterReceivePayload(
	red_audio_codec, &new_payload_created));
	EXPECT_TRUE(new_payload_created);

	EXPECT_EQ(kRedPayloadType, rtp_payload_registry.red_payload_type());

	const RtpUtility::Payload* retrieved_payload =
	rtp_payload_registry.PayloadTypeToPayload(kRedPayloadType);
	EXPECT_TRUE(retrieved_payload);
	EXPECT_TRUE(retrieved_payload->audio);
	EXPECT_STRCASEEQ("red", retrieved_payload->name);

	// Sample rate is correctly registered.
	EXPECT_EQ(kRedSampleRate,
	rtp_payload_registry.GetPayloadTypeFrequency(kRedPayloadType));
	}

	TEST(RtpPayloadRegistryTest,
	DoesNotAcceptSamePayloadTypeTwiceExceptIfPayloadIsCompatible) {
	uint8_t payload_type = 97;
	RTPPayloadRegistry rtp_payload_registry;

	bool ignored = false;
	CodecInst audio_codec = kTypicalAudioCodec;
	audio_codec.pltype = payload_type;
	EXPECT_EQ(0,
	rtp_payload_registry.RegisterReceivePayload(audio_codec, &ignored));

	CodecInst audio_codec_2 = kTypicalAudioCodec;
	audio_codec_2.pltype = payload_type;
	// Make \|audio_codec_2\| incompatible with \|audio_codec\| by changing
	// the frequency.
	audio_codec_2.plfreq = kTypicalFrequency + 1;
	EXPECT_EQ(
	-1, rtp_payload_registry.RegisterReceivePayload(audio_codec_2, &ignored))
	<< "Adding incompatible codec with same payload type = bad.";

	// Change payload type.
	audio_codec_2.pltype = payload_type - 1;
	EXPECT_EQ(
	0, rtp_payload_registry.RegisterReceivePayload(audio_codec_2, &ignored))
	<< "With a different payload type is fine though.";

	// Ensure both payloads are preserved.
	const RtpUtility::Payload* retrieved_payload =
	rtp_payload_registry.PayloadTypeToPayload(payload_type);
	EXPECT_TRUE(retrieved_payload);
	EXPECT_STREQ(kTypicalPayloadName, retrieved_payload->name);
	EXPECT_TRUE(retrieved_payload->audio);
	EXPECT_EQ(kTypicalFrequency, retrieved_payload->typeSpecific.Audio.frequency);
	EXPECT_EQ(kTypicalChannels, retrieved_payload->typeSpecific.Audio.channels);

	retrieved_payload =
	rtp_payload_registry.PayloadTypeToPayload(payload_type - 1);
	EXPECT_TRUE(retrieved_payload);
	EXPECT_STREQ(kTypicalPayloadName, retrieved_payload->name);
	EXPECT_TRUE(retrieved_payload->audio);
	EXPECT_EQ(kTypicalFrequency + 1,
	retrieved_payload->typeSpecific.Audio.frequency);
	EXPECT_EQ(kTypicalChannels, retrieved_payload->typeSpecific.Audio.channels);

	// Ok, update the rate for one of the codecs. If either the incoming rate or
	// the stored rate is zero it's not really an error to register the same
	// codec twice, and in that case roughly the following happens.
	EXPECT_EQ(0,
	rtp_payload_registry.RegisterReceivePayload(audio_codec, &ignored));
	}

	TEST(RtpPayloadRegistryTest,
	RemovesCompatibleCodecsOnRegistryIfCodecsMustBeUnique) {
	uint8_t payload_type = 97;
	RTPPayloadRegistry rtp_payload_registry;

	bool ignored = false;
	CodecInst audio_codec = kTypicalAudioCodec;
	audio_codec.pltype = payload_type;
	EXPECT_EQ(0,
	rtp_payload_registry.RegisterReceivePayload(audio_codec, &ignored));
	CodecInst audio_codec_2 = kTypicalAudioCodec;
	audio_codec_2.pltype = payload_type - 1;
	EXPECT_EQ(
	0, rtp_payload_registry.RegisterReceivePayload(audio_codec_2, &ignored));

	EXPECT_FALSE(rtp_payload_registry.PayloadTypeToPayload(payload_type))
	<< "The first payload should be "
	"deregistered because the only thing that differs is payload type.";
	EXPECT_TRUE(rtp_payload_registry.PayloadTypeToPayload(payload_type - 1))
	<< "The second payload should still be registered though.";

	// Now ensure non-compatible codecs aren't removed. Make \|audio_codec_3\|
	// incompatible by changing the frequency.
	CodecInst audio_codec_3 = kTypicalAudioCodec;
	audio_codec_3.pltype = payload_type + 1;
	audio_codec_3.plfreq = kTypicalFrequency + 1;
	EXPECT_EQ(
	0, rtp_payload_registry.RegisterReceivePayload(audio_codec_3, &ignored));

	EXPECT_TRUE(rtp_payload_registry.PayloadTypeToPayload(payload_type - 1))
	<< "Not compatible; both payloads should be kept.";
	EXPECT_TRUE(rtp_payload_registry.PayloadTypeToPayload(payload_type + 1))
	<< "Not compatible; both payloads should be kept.";
	}

	TEST(RtpPayloadRegistryTest,
	LastReceivedCodecTypesAreResetWhenRegisteringNewPayloadTypes) {
	RTPPayloadRegistry rtp_payload_registry;
	rtp_payload_registry.set_last_received_payload_type(17);
	EXPECT_EQ(17, rtp_payload_registry.last_received_payload_type());

	bool media_type_unchanged = rtp_payload_registry.ReportMediaPayloadType(18);
	EXPECT_FALSE(media_type_unchanged);
	media_type_unchanged = rtp_payload_registry.ReportMediaPayloadType(18);
	EXPECT_TRUE(media_type_unchanged);

	bool ignored;
	CodecInst audio_codec = kTypicalAudioCodec;
	audio_codec.pltype = 34;
	EXPECT_EQ(0,
	rtp_payload_registry.RegisterReceivePayload(audio_codec, &ignored));

	EXPECT_EQ(-1, rtp_payload_registry.last_received_payload_type());
	media_type_unchanged = rtp_payload_registry.ReportMediaPayloadType(18);
	EXPECT_FALSE(media_type_unchanged);
	}

	class ParameterizedRtpPayloadRegistryTest
	: public ::testing::TestWithParam<int> {};

	TEST_P(ParameterizedRtpPayloadRegistryTest,
	FailsToRegisterKnownPayloadsWeAreNotInterestedIn) {
	RTPPayloadRegistry rtp_payload_registry;

	bool ignored;
	CodecInst audio_codec;
	strncpy(audio_codec.plname, "whatever", RTP_PAYLOAD_NAME_SIZE);
	audio_codec.pltype = GetParam();
	audio_codec.plfreq = 1900;
	audio_codec.channels = 1;
	EXPECT_EQ(-1,
	rtp_payload_registry.RegisterReceivePayload(audio_codec, &ignored));
	}

	INSTANTIATE_TEST_CASE_P(TestKnownBadPayloadTypes,
	ParameterizedRtpPayloadRegistryTest,
	testing::Values(64, 72, 73, 74, 75, 76, 77, 78, 79));

	class RtpPayloadRegistryGenericTest : public ::testing::TestWithParam<int> {};

	TEST_P(RtpPayloadRegistryGenericTest, RegisterGenericReceivePayloadType) {
	RTPPayloadRegistry rtp_payload_registry;

	bool ignored;
	CodecInst audio_codec;
	// Dummy values, except for payload_type.
	strncpy(audio_codec.plname, "generic-codec", RTP_PAYLOAD_NAME_SIZE);
	audio_codec.pltype = GetParam();
	audio_codec.plfreq = 1900;
	audio_codec.channels = 1;
	EXPECT_EQ(0,
	rtp_payload_registry.RegisterReceivePayload(audio_codec, &ignored));
	}

	// Generates an RTX packet for the given length and original sequence number.
	// The RTX sequence number and ssrc will use the default value of 9999. The
	// caller takes ownership of the returned buffer.
	const uint8_t* GenerateRtxPacket(size_t header_length,
	size_t payload_length,
	uint16_t original_sequence_number) {
	uint8_t* packet =
	new uint8_t[kRtxHeaderSize + header_length + payload_length]();
	// Write the RTP version to the first byte, so the resulting header can be
	// parsed.
	static const int kRtpExpectedVersion = 2;
	packet[0] = static_cast<uint8_t>(kRtpExpectedVersion << 6);
	// Write a junk sequence number. It should be thrown away when the packet is
	// restored.
	ByteWriter<uint16_t>::WriteBigEndian(packet + 2, 9999);
	// Write a junk ssrc. It should also be thrown away when the packet is
	// restored.
	ByteWriter<uint32_t>::WriteBigEndian(packet + 8, 9999);

	// Now write the RTX header. It occurs at the start of the payload block, and
	// contains just the sequence number.
	ByteWriter<uint16_t>::WriteBigEndian(packet + header_length,
	original_sequence_number);
	return packet;
	}

	void TestRtxPacket(RTPPayloadRegistry* rtp_payload_registry,
	int rtx_payload_type,
	int expected_payload_type,
	bool should_succeed) {
	size_t header_length = 100;
	size_t payload_length = 200;
	size_t original_length = header_length + payload_length + kRtxHeaderSize;

	RTPHeader header;
	header.ssrc = 1000;
	header.sequenceNumber = 100;
	header.payloadType = rtx_payload_type;
	header.headerLength = header_length;

	uint16_t original_sequence_number = 1234;
	uint32_t original_ssrc = 500;

	std::unique_ptr<const uint8_t[]> packet(GenerateRtxPacket(
	header_length, payload_length, original_sequence_number));
	std::unique_ptr<uint8_t[]> restored_packet(
	new uint8_t[header_length + payload_length]);
	size_t length = original_length;
	bool success = rtp_payload_registry->RestoreOriginalPacket(
	restored_packet.get(), packet.get(), &length, original_ssrc, header);
	EXPECT_EQ(should_succeed, success)
	<< "Test success should match should_succeed.";
	if (!success) {
	return;
	}

	EXPECT_EQ(original_length - kRtxHeaderSize, length)
	<< "The restored packet should be exactly kRtxHeaderSize smaller.";

	std::unique_ptr<RtpHeaderParser> header_parser(RtpHeaderParser::Create());
	RTPHeader restored_header;
	ASSERT_TRUE(
	header_parser->Parse(restored_packet.get(), length, &restored_header));
	EXPECT_EQ(original_sequence_number, restored_header.sequenceNumber)
	<< "The restored packet should have the original sequence number "
	<< "in the correct location in the RTP header.";
	EXPECT_EQ(expected_payload_type, restored_header.payloadType)
	<< "The restored packet should have the correct payload type.";
	EXPECT_EQ(original_ssrc, restored_header.ssrc)
	<< "The restored packet should have the correct ssrc.";
	}

	TEST(RtpPayloadRegistryTest, MultipleRtxPayloadTypes) {
	RTPPayloadRegistry rtp_payload_registry;
	// Set the incoming payload type to 90.
	RTPHeader header;
	header.payloadType = 90;
	header.ssrc = 1;
	rtp_payload_registry.SetIncomingPayloadType(header);
	rtp_payload_registry.SetRtxSsrc(100);
	// Map two RTX payload types.
	rtp_payload_registry.SetRtxPayloadType(105, 95);
	rtp_payload_registry.SetRtxPayloadType(106, 96);

	TestRtxPacket(&rtp_payload_registry, 105, 95, true);
	TestRtxPacket(&rtp_payload_registry, 106, 96, true);
	}

	TEST(RtpPayloadRegistryTest, InvalidRtxConfiguration) {
	RTPPayloadRegistry rtp_payload_registry;
	rtp_payload_registry.SetRtxSsrc(100);
	// Fails because no mappings exist and the incoming payload type isn't known.
	TestRtxPacket(&rtp_payload_registry, 105, 0, false);
	// Succeeds when the mapping is used, but fails for the implicit fallback.
	rtp_payload_registry.SetRtxPayloadType(105, 95);
	TestRtxPacket(&rtp_payload_registry, 105, 95, true);
	TestRtxPacket(&rtp_payload_registry, 106, 0, false);
	}

	INSTANTIATE_TEST_CASE_P(TestDynamicRange,
	RtpPayloadRegistryGenericTest,
	testing::Range(96, 127 + 1));

	} // namespace webrtc